Automatic lock slider for slide fasteners



L. WEINER March 15, 1966 AUTOMATIC LOCK SLIDER FOR SLIDE FASTENERS Filed Sept. 17, 1964 ATTORNEY United States Patent 3,239,905 AUTOMATIC LOCK SLIDER FOR SLIDE FASTENERS Lewis Weiner, 44-02 11th St., Long Island City 1, NY. Filed Sept. 17, 1964, Ser. No. 397,337 2 Claims. (Cl. z4 2os.14

The invention relates to an automatic lock slider for slide fasteners.

The primary object of the invention is to provide a simple and effective construction for a slide fastener slider, utilizing a die-cast body, which is capable of easy automatic assembly, and which is therefore inexpensive to manufacture.

In general, the invention contemplates the provision of a die-cast body with a wire spring having a bent portion capable of engaging the scoops of the fastener, arranged in a recess in the slider body, and a sheet metal plate covering this recess and acting to cover the spring, this plate being held in position by swaged portions of the slider body.

Further objects and advantages of the invention will appear more fully from the following description, particularly when taken in conjunction with the accompanying drawings which form a part thereof.

In the drawings:

FIG. 1 shows in perspective an automatic lock slider embodying the invention;

FIG. 2 is a similar view of the die-cast slider body;

FIG. 3 is a vertical cross-section through the slider;

FIG. 4 is a top plan view;

FIG. 5 shows in cross-section a part of a modified form of the invention; and

FIG. 6 shows a detail of a further modification.

The slider shown in FIGS. 1 to 4 includes a die-cast body 2 having wings 4, 6 connected by a post 8 and providing the usual channel therebetween for the scoops pro duced by the wings 10 and the smaller wings 12.

The body includes upstanding blocks 14, 16 aligned with each other, and separated by a gap 18.

The blocks 14 and 16 have cut-out recesses 20 and 22 respectively in their upper faces.

The block 14 also has a recess 24 extending downwardly thereinto from its upper face, and a groove 26 extending from the top of opening 24 to the notch 18. In the upper wing, at the bottom of the notch 18, is an opening 28 into the channel formed by the wings.

A piece of spring wire bent in the manner shown includes a portion 30 frictionally engaged within the recess 24, a portion 32 lying in the groove 26 and a downwardly bent portion extending into the channel for engagement with scoops running therethrough.

A pull tab 36 is provided having inwardly bent portions 38 lying within the notch 18 beneath the downwardly bent portion of the spring. The notch 18 at its upper end has a sloping surface 40, the result being that when the pull tab is moved in either direction it will act on the spring to lift the tongue 34 out of the scoop channel.

While the spring has frictional engagement in the recess "ice 24, its positioning is assured by a thin plate 42 having end portions 44 engaging in the recesses 20, 22 and lateral projections 46 engaging in the notch 18. This plate is held in position by swaging, as at 48, the end portion of the posts 14, 16 over the edge of the plate.

The type of slider described above is capable of automatic assembly on a machine. Such a machine would include a four-position index table, having in the first position means for feeding the die-cast body and the pull tab to positions in which the pull tab can be inserted into the notch 18 and held therein by suitable clamping members; a second portion in which a piece of suitable length is cut off from a strip of spring wire, shaped to the proper shape and inserted in the slider body; and a third portion in which a preshaped cover is cut off from a strip, inserted and secured by swaging. The fourth portion would be the ejecting portion.

FIG. 5 shows a modified form of the invention, in which the post 14 has, in addition to the recess 20 for the cover section 44, a deeper recess 58 in which is fitted one end 60 of a spring wire member, the other end of which is bent down at 62 through opening 28.

This may be assembled in the same manner as the device of FIGURES 1 to 4.

It is likewise possible, as seen in FIG. 6 to secure the cover plate end portions 44 in position by swaging over the edges of the posts, as at 48, along the sides rather than the ends.

While I have described herein some embodiments of my invention, I wish it to be understood that I do not intend to limit myself thereby except within the scope of the claims hereto or hereinafter appended.

I claim:

1. An automatic lock slider for slide fasteners comprising spaced wings and a post connecting said wings at one end, said wings forming between them a channel for slide fastener scoops, the upper wings having upwardly projecting blocks with a gap therebetween, each of said blocks having a first recess in its upper face, one of said blocks having a second recess extending downwardly from within said first recess, the upper wing having an opening therethrough at the gap between the blocks, a spring having a portion located in the second recess and a downwardly bent end passing through said opening into said channel, a pull tab having a portion extending into the gap engaged beneath the spring, and a plate lying in said first recesses, parts of the blocks at the edges of the first recesses being swaged over the edges of the plate, said plate overlying said spring.

2. In a slider as claimed in claim 1, said second recess being substantially deeper than the first recess, the spring including a part frictionally engaged in the second recess.

References Cited by the Examiner UNITED STATES PATENTS WILLIAM FELDMAN, Primary Examiner. 

1. AN AUTOMATIC LOCK SLIDER FOR SLIDE FASTENERS COMPRISING SPACED WINGS AND A POST CONNECTING SAID WINGS AT ONE END, SAID WINGS FORMING BETWEEN THEM A CHANNEL FOR SLIDE FASTENER SCOOPS, THE UPPER WINGS HAVING UPWARDLY PROJECTING BLOCKS WITH A GAP THEREBETWEEN, EACH OF SAID BLOCKS HAVING A FIRST RECESS IN ITS UPPER FACE, ONE OFAN SAID BLOCKS HAVING A SECOND RECESS EXTENDING DOWNWARDLY FROM WITHIN SAID FIRST RECESS, THE UPPER WING HAVING AN OPENING THERETHROUGH AT THE GAP BETWEEN THE BLOCKS, A SPRING HAVING A PORTION LOCATED IN THE SECOND RECESS AND A DOWNWARDLY BENT END PASSING THROUGH SAID OPENING INTO SAID CHANNEL, A PULL TAB HAVING A PORTION EXTENDING INTO THE GAP ENGAGED BENEATH THE SPRING, AND A PLATE LYING IN SAID FIRST RECESSES, PARTS OF THE BLOCKS AT THE EDGES OF THE FIRST RECESSES BEING SWAGED OVER THE EDGES OF THE PLATE, SAID PLATE OVERLYING SAID SPRING. 